EP2436166B1 - Interface de service - Google Patents

Interface de service Download PDF

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Publication number
EP2436166B1
EP2436166B1 EP10736596.7A EP10736596A EP2436166B1 EP 2436166 B1 EP2436166 B1 EP 2436166B1 EP 10736596 A EP10736596 A EP 10736596A EP 2436166 B1 EP2436166 B1 EP 2436166B1
Authority
EP
European Patent Office
Prior art keywords
firewall
network
server
user
access
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10736596.7A
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German (de)
English (en)
Other versions
EP2436166A1 (fr
Inventor
Robert Manfred Albrecht
Ronald Brandt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
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Deutsche Telekom AG
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Publication date
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Publication of EP2436166A1 publication Critical patent/EP2436166A1/fr
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Publication of EP2436166B1 publication Critical patent/EP2436166B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0209—Architectural arrangements, e.g. perimeter networks or demilitarized zones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0227—Filtering policies
    • H04L63/0236—Filtering by address, protocol, port number or service, e.g. IP-address or URL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0815—Network architectures or network communication protocols for network security for authentication of entities providing single-sign-on or federations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H04L63/102—Entity profiles

Definitions

  • the invention relates to a system for allowing access to services or computers from a first local area network in a second local area network, both networks being connected via a common intermediate area network (DMZ).
  • DMZ common intermediate area network
  • VPN virtual private network
  • the object of the present invention is an alternative provision of services for users who work in a first private network and who need the services in a second private network.
  • a scenario may exist if an employee who works for company A but is employed by company B wants to retrieve his e-mails stored in company B. To do this, he would normally have to dial into the company's network via a VPN connection with his computer in order to then be able to read the e-mails on his computer. However, this presupposes that the computer on which he is currently working has also installed the necessary client software and has the necessary access rights with respect to the firewall in network A of company A. From the " Citrix Access Gateway Enterprise Edition Administrator's Guide "November 2008 is the configuration of an Access Gateway of the corresponding manufacturer known. Out " Firewalls for Dummies "2003 Wiley Publishing is the configuration of firewalls known. The US 2005 / 198380A1 also concerns the control of network access.
  • the object of the present invention is to provide access to services in a first local area network A from a second local area network B, where both networks are secured via a firewall, and both networks are connected via a network located between the firewalls. Access authorizations should be clarified and the restriction to certain services should be achieved.
  • a network A secured by a firewall Fa is connected via a network Nab, in one possible embodiment designed as a DMZ, to a network B, which in turn is secured by a firewall Fb.
  • a network A in which a user U1 works with his computer C1. This wants to access the network B, so he can use services S1 there.
  • a possible service S1 is z. For example, access to the mail server or the appointment server. Other services are conceivable, such as file servers, databases or the like.
  • the user U1 / C1 logs on to the firewall Fa via a suitable authentication.
  • Smart cards are used in the preferred embodiment.
  • the authentication can be specified via a rule that the user can only access a specific server SNab, within the network Nab, ie within the DMZ.
  • This server is also referred to as a jump server and manages applications.
  • this is a terminal server or application streaming server, such as that offered by Citrix, or a Unix / Linux server that manages and provides applications.
  • the applications such as mail programs operating on this server SNab in turn, mature via the firewall Fb on the network B to retrieve the data stored there. in case of a Mailservers, z.
  • an Outlook ⁇ (R)> program or a Lotus Notes ⁇ (R)> client is made available to the user to access the applications.
  • the personal mail data is located on a mail server working on network B.
  • the server SNab can also access the network B. This is achieved by the server SNab being assigned a unique IP address to each user who has dialed in on the server SNab. This requires a large pool of IP addresses, which is preferably selected from the area of private IP addresses. It is also possible for a user to be assigned multiple IP addresses.
  • the IP addresses are assigned to the user in a central directory (eg LDAP).
  • the firewall Fb uses the IP address to identify which user it must be, and can use specific rules to determine which servers SNb the user on network B can access. So z. For example, a user who only wants to retrieve e-mail has access to an e-mail server on network B. Based on the IP address, the firewall Fb can now use the directory service to retrieve rules that determine which server SNb the user can access. It should be noted that in another embodiment, the user must also authenticate to the firewall Fb.
  • the rules are managed in an LDAP. It is a directory that centrally manages users' rules and authentication.
  • an approach with a single sign-on is chosen in a preferred embodiment.
  • the user only logs in once or authenticates once and can then access different services without having to perform an authentication each time again. Rather, there is a query in the background by the services that check whether the person has already logged in correctly in another permissible system. If the approach of single-sign-on is not selected, it usually requires three authentications. The first authentication takes place at the Firewall Fa, the second at the server Sab and the third at the Firewall Fb.
  • the network in HP is a DMZ.
  • a demilitarized zone (DMZ, also demilitarized or demilitarized zone) refers to a computer network with security-controlled access to the connected server.
  • the systems installed in the DMZ are shielded by one or more firewalls against other networks (eg Internet, LAN). This separation allows access to publicly accessible services (bastion hosts with eg e-mail, WWW or similar) while protecting the internal network (LAN) from unauthorized access.
  • the servers in the DMZ access network B via a secure connection to the servers in network B.
  • the connection between the computer of the user and the server Sab is also encrypted, as well as the connection of the server Sab in the network B. This can be done from the firewall Fa or already from the user's computer.
  • firewall Fa Fal, .., fan redundant
  • different DMZ can be addressed through the firewall, if one of the DMZ is not available or the servers are not reachable within the DMZ.
  • the firewall Fa automatically switches to another DMZ, which usually also includes alternative servers (Jump server). It is also conceivable that within a DMZ several of the jump servers are arranged, which are addressed depending on the load.
  • the load balancing which is a meaningful utilization of the server, is performed either by an upstream proxy system, which is located in front of the server, or by the firewall itself, the requests for a specific algorithm, for example, such as round robin Robin, forwards.
  • a specific algorithm for example, such as round robin Robin, forwards.
  • the load-balancing techniques provided by the manufacturer can be used.
  • the fig. 1 shows in front of a first firewall 7, also called Fb, a jump server 1, which allows users 2, 3 in the network B to access applications.
  • the jump server then forwards the requests to the servers 16 or the server 15.
  • the jump server is not located behind the firewall 7, but in front of the firewall. This is a fundamental exception to the present approach.
  • the split tunnel can be active in individual cases in the case of a selective split tunnel.
  • the jump server streams the application (transfers the program file plus some control files) to the user's computer. There it is executed within a protected environment (sandbox, a kind of virtual machine). Leave over with the transferred control files to limit the communication possibilities of the application. It controls whether the application is allowed to access the local storage media, whether an interaction with the clipboard is allowed, whether the applications may access other network resources, ...
  • control files are transmitted individually for each application, it is possible to regulate the communication options for each individual application: the so-called selective split tunnel.
  • a real split tunnel is different.
  • the VPN client includes the option to disable the split tunnel when setting up the VPN tunnels. At the moment of tunnel setup, the VPN client stops communication with all networks except its own tunnel.
  • This function of the VPN client is controlled by a control file which is located on the local hard drive of the user PC. This allows the Split Tunnel to be switched on or off.
  • the VPN client offers the option of checking the configuration of the user PC for certain features at the moment of tunnel setup. These features can z. For example, the file date or the existence of a particular file or its contents. Similarly, the presence of certain processes or registry keys can be checked.
  • the content of the control file for switching the split tunnel on / off is checked. If this file does not meet the requirements, the tunnel will not be successfully established. Thus even a user with administrative rights can not set up the tunnel with an active split tunnel. Although he could change the contents of the control file, the tunnel construction would then fail.
  • the user in network B wants to access an application, such as a mail server 15, 16, for example.
  • the jump server 1 is accessed, which has the same functionality as the jump servers 10 and 9, but which are arranged in the DMZ behind the firewall 7.
  • the jump server then forwards the request via a virtual encrypted connection (VPN) to the servers 16, 15, 14, 13.
  • VPN virtual encrypted connection
  • the redirection takes place via a jump server, which is arranged between the firewalls 7 and 8, the information 18 is forwarded to the firewall 7, where authentication takes place.
  • the request is forwarded to the Jump servers.
  • Authentication at the jump server 10, 9 is then either again explicitly or by a single-sign-on approach.
  • LDAP directory service
  • the requests 19 are redirected via either the firewall 8 or 7 to corresponding servers 16, 15, 14 and 13, using unique IP addresses assigned to the user by the JumpServer .
  • Each user has a unique, or one Group of unique IP addresses that allow conclusions about the identity of the user. These IP addresses are z. B. stored in the LDAP.
  • Using these unique IP addresses on the Jump Server then accesses servers 13-16.
  • the firewall must pass through 8 Fa, which recognizes which user it is based on the IP address and other authorization information.
  • Based on a set of rules 20 it is now determined to which server 13 an access in the network A can take place.
  • the same approach can also be taken from network A by users 11 and 12.
  • the network A further has a local server 23, which is not integrated in the access.
  • the fig. 2 shows a redundant approach. There are a number of firewalls, each allowing access to a jump server. If one of the servers or the firewall fails, the requests are redirected either via another firewall or to another Jump server in the respective countries, so that a redundancy is given.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Computer And Data Communications (AREA)

Claims (9)

  1. Un procédé permettant à un utilisateur U1 d'accéder de façon sécurisée à son ordinateur C1 au sein d'un premier réseau local A, pour des services numériques (13, 15, 16) au sein d'un second réseau local B, dans lequel les deux réseaux sont sécurisés au moyen d'un pare-feu (7, 8), et dans lequel les deux réseaux sont connectés via un Nab de réseau disposés entre les pare-feux, comprenant les étapes :
    - authentification de l'utilisateur U1 au niveau du premier pare-feu (7, 8) ;
    - détermination, suite à l'authentification, au moyen d'une règle que l'utilisateur U1 est autorisé à accédé à un serveur de saut spécifique (13, 15, 16) au sein du Nab de réseau ;
    - accès au serveur de saut (9, 10) et authentification de l'utilisateur U1 au niveau du serveur de saut (9 10), et affectation d'une unique adresse IP dépendant de l'authentification ;
    - accès au service (13, 15, 16) au sein du second réseau B via le serveur de saut (9, 10), dans lequel intervient une authentification de l'adresse IP sur le second pare-feu (7, 8) ;
    - détermination d'une règle sur le second pare-feu (7, 8) sur la base de l'adresse IP pour vérifier que l'accès au service (13, 15, 16) peut être autorisé, si un accès est autorisé, la transmission de la requête du serveur de saut (9, 10) au service (13, 15, 16) au sein du second réseau B.
  2. Le procédé selon la revendication précédente, dans lequel une ou plusieurs adresses IP utilisées par le serveur de saut sont affectées de manière unique à un utilisateur.
  3. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel les règles et/ou les adresses IP affectées à un utilisateur sont stockée au sein d'un répertoire central, tel que LPAD.
  4. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel un procédé d'enregistrement unique est utilisé pour l'authentification au premier pare-feu et au second pare-feu et/ou au serveur de saut.
  5. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel le réseau Nab est une zone démilitarisée, DMZ.
  6. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel les connexions entre le pare-feu, le serveur de saut et les services sont chiffrées.
  7. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel il y a une pluralité de pare-feux, qui sont conçus dans un esprit de redondance, de façon à ce que, à tout moment, l'accès peut être réalisé à un serveur de saut dans une ou plusieurs DMZ.
  8. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel différentes DMZ sont adressées par le pare-feu, si l'une quelconque des DMZ n'est pas atteignable ou si les serveurs qui sont au sein de la DMZ ne peuvent être atteints.
  9. Le procédé selon une ou plusieurs des revendications précédentes, dans lequel un équilibrage de charge intervient pour une pluralité de serveur de saut, de façon à éviter que ne se produise une surcharge d'un seul côté des serveurs de saut.
EP10736596.7A 2009-05-28 2010-05-05 Interface de service Active EP2436166B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009022977A DE102009022977A1 (de) 2009-05-28 2009-05-28 Service Interface
PCT/DE2010/000437 WO2010136003A1 (fr) 2009-05-28 2010-05-05 Interface de service

Publications (2)

Publication Number Publication Date
EP2436166A1 EP2436166A1 (fr) 2012-04-04
EP2436166B1 true EP2436166B1 (fr) 2016-03-23

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Application Number Title Priority Date Filing Date
EP10736596.7A Active EP2436166B1 (fr) 2009-05-28 2010-05-05 Interface de service

Country Status (6)

Country Link
EP (1) EP2436166B1 (fr)
DE (1) DE102009022977A1 (fr)
ES (1) ES2580677T3 (fr)
HU (1) HUE029009T2 (fr)
PL (1) PL2436166T3 (fr)
WO (1) WO2010136003A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110661761B (zh) 2018-06-29 2021-12-14 西门子股份公司 一种访问控制设备、方法、计算机程序产品和计算机可读介质
WO2022026799A1 (fr) * 2020-07-30 2022-02-03 Open Text Holdings, Inc. Systèmes de gestion d'agent de point d'extrémité et procédés de sécurité de point d'extrémité à distance

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7287271B1 (en) * 1997-04-08 2007-10-23 Visto Corporation System and method for enabling secure access to services in a computer network
US7272625B1 (en) * 1997-03-10 2007-09-18 Sonicwall, Inc. Generalized policy server
US20010042202A1 (en) * 2000-04-14 2001-11-15 Horvath Charles J. Dynamically extendible firewall
US7984157B2 (en) * 2002-02-26 2011-07-19 Citrix Systems, Inc. Persistent and reliable session securely traversing network components using an encapsulating protocol
US7263614B2 (en) * 2002-12-31 2007-08-28 Aol Llc Implicit access for communications pathway
JP4119295B2 (ja) * 2003-04-07 2008-07-16 東京エレクトロン株式会社 保守・診断データ蓄積サーバ、保守・診断データの蓄積・取得システム、保守・診断データの蓄積・提供システム
US20050251855A1 (en) * 2004-05-04 2005-11-10 Hob Gmbh & Co. Kg Client-server-communication system
JP4492248B2 (ja) * 2004-08-04 2010-06-30 富士ゼロックス株式会社 ネットワークシステム、内部サーバ、端末装置、プログラム、およびパケット中継方法
EP2061205A3 (fr) * 2007-11-16 2009-06-17 Hewlett-Packard Development Company, L.P. Procédé et dispositif pour l'accès au réseau

Also Published As

Publication number Publication date
HUE029009T2 (en) 2017-02-28
WO2010136003A1 (fr) 2010-12-02
EP2436166A1 (fr) 2012-04-04
DE102009022977A1 (de) 2010-12-02
ES2580677T3 (es) 2016-08-25
PL2436166T3 (pl) 2016-10-31

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